Methods and apparatus for display element management in an information network

ABSTRACT

Methods and apparatus for managing display elements such as GUI windows in a client device (e.g., consumer premises equipment in a cable network) running multiple related or unrelated applications. In one embodiment, an improved window management entity is provided within the device with which HAVi-compliant application(s) can interface in order to access display elements according to a priority structure or hierarchy. One or more privileged applications are designated and allowed to affect the priority structure, including requesting a new in-focus application to be placed atop the priority structure. The network operator can also optionally control the operation of the window manager remotely via a network agent. Improved client device and network configurations, as well as methods of operating these systems, are also disclosed.

COPYRIGHT

A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever.

BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention relates generally to the field of software applications used on an information network (such as a cable television network), and specifically to the management and control of windows or other user display elements between multiple applications.

2. Description of Related Technology

Software applications are well known in the prior art. Such applications may run on literally any type of electronic device, and may be distributed across two or more locations or devices connected by a network. Often, a so-called “client/server” architecture is employed, where one or more portions of applications disposed on client or consumer premises devices (e.g., PCs, PDAs, digital set-top boxes {DSTBs}, hand-held computers, etc.) are operatively coupled and in communication with other (server) portions of the application. Such is the case in the typical hybrid fiber coax (HFC) or satellite content network, wherein consumer premises equipment or CPE (e.g., DSTBs or satellite receivers) utilize the aforementioned “client” portions of applications to communicate with their parent server portions in order to provide downstream and upstream communications and data/content transfer.

Digital TV (DTV) is an emerging technology which utilizes digitized and compressed data formats (e.g., MPEG) for content transmission, as compared to earlier analog “uncompressed” approaches (e.g., NTSC). The DTV content may be distributed across any number of different types of bearer media or networks with sufficient bandwidth, including HFC, satellite, wireless, or terrestrial. DTV standards such as the OpenCable Application Platform middleware specification (e.g., Version 1.0, and incipient Version 2.0) require that applications be downloaded to CPE from the bearer or broadcast network in real-time. The OCAP specification is a middleware software layer specification intended to enable the developers of interactive television services and applications to design such products so that they will run successfully on any cable television system in North America, independent of set-top or television receiver hardware or operating system software choices.

A recently proposed Home Audio Video Interoperability (HAVi) standard is a consumer electronics (CE) industry standard designed to permit conforming digital audio and video devices, regardless of manufacturer, to interoperate when connected via a network in the consumer's home. The HAVi standard uses the digital IEEE-1394 network standard for data transfer between devices and the 1394 A/VC protocols for device control.

The HAVi standard focuses on the transfer and processing (for example, recording and playback) of digital content between networked devices. HAVi-compliant devices will include not only familiar audio and video components but also cable modems, digital set-top boxes and “smart” storage devices such as personal video recorders (PVRs). In the future, other kinds of devices such as videophones and personal digital assistants (PDAs) also may become part of a HAVi home network. By letting a TV set, or any other device on the network that has a display capability, act as a network hub to both control and show the status of any connected device, compliance with the HAVi standard will make consumer electronic equipment easier to use. In a HAVi-compliant system, all of the networked components can be run from the TV with one remote control. A home PC will not be required for a HAVi-compliant system to operate, such system being independent of any operating system or microprocessor. However, a PC can act as a HAVi-compliant device, with the ability to control other connected devices.

Compliance with the HAVi standard also allows disparate brand devices to be hooked into a home network. A DV camcorder, video game player or even a refrigerator conforming to the HAVi standard could be plugged into a network and have its features automatically available for use by other devices on the network. From the consumer's perspective, all that is required is to select a task for a device and the HAVi host will order the task performed.

By employing modular software, the HAVi standard allows consumer electronics devices to identify themselves and what they can do when plugged into the host. The software functions by assigning a device control ID module to each hardware component of a system. Each system also is assigned multiple functional component modules, containing information about an individual device's capabilities, for example, whether a camcorder operates in DV format, or whether a receiver is designed to process AC3 audio.

HAVi-compliant devices automatically register their operating status, device functions and location with other components in the network. So when a host device recognizes a new component on a HAVi system, the host loads the appropriate device and functional modules, allowing users to control the target device from the host.

Despite the foregoing, the features promised by the HAVi standard will only be available for HAVi-compliant devices. Further, the HAVi standard anticipates that the graphical user interface of the network of components is displayed on a television or other video display component of the system, thus requiring the video display component to be powered on when using a system device. If a user desires to use only the audio components of a system the video display must still be powered on.

The user interface (UI) aspects of HAVi were adopted by several relevant and well known standards including OCAP, MHP, ACAP, and GEM. However, in the context of multiple unrelated applications running concurrently (and each possibly displaying one or more windows), the current OCAP graphics reference model imposes unwanted constraints. For example, when running a ticker application, OCAP provides no mechanism to guarantee that the ticker window is not overlaid by another application's window. It is also recognized that the MHP Standard from which OCAP is derived (i.e., Version 1.0.2) only runs applications that are associated; i.e., delivered in the same service and programmed to work together. This, however, is not the case with OCAP, which extends MHP to allow other types of applications not associated with applications in a particular service to run concurrently with any other applications. This heterogeneous application capability of OCAP can accordingly create many different mixtures of different applications each with different windowing requirements and capabilities.

HAVi states that any system using HAVi should define a “home navigation shell” if any window management rules beyond the base HAVi definition are needed. HAVi specifies z-ordering and other window management aspects within an application, but does not address cross-application window management.

In addition to the HAVi approach described above, a variety of other approaches to application window management and handling within computer and network systems in general are taught in the prior art.

For example, U.S. Pat. No. 4,845,644 to Anthias, et al. issued Jul. 4, 1989 and entitled “Data display system” discloses a data display system in which input-output display devices are connected to a central processor, and users select application programs that are run on the central processor. The control system of the central processor includes a display manager control system and a windowing control mechanism which allows a plurality of tasks to be performed concurrently and the results displayed in areas of a display screen. The windowing control mechanism includes, a task manager control program which runs as an application in the display manager control system and includes means to interact, via the display manager, with the operator to allow applications to be initiated, means to create tasks to control the processing of the application in such a way that the applications can be suspended or resumed according to whether the operator is ready for them, and means to identify to the display manager a coordination controller that the display manager can call to allow the task manager to suspend and resume applications. The display manager includes, means to combine data from each application and build a display representation that shows many windows into the various applications onto a single screen, and means to call the coordination controller identified by the task management application so that the task manager can suspend applications that are waiting for input and resume those applications which have input available.

U.S. Pat. No. 4,890,098 to Dawes, et al. issued Dec. 26, 1989 and entitled “Flexible window management on a computer display” discloses a technique for managing windows in a display system. The window manager allows a user to mark an area on the display to define the dimensions and contents of a resized window. All non-hidden text and attributes within the enclosed area are incorporated into the resized window; however, the original windows do not lose their original characteristics. The marked area may span multiple windows, so multiple windows may be incorporated into the newly resized window. For each position within the newly resized window, a check is made for a window below. If no window exists below this position, the default, or background, character and attribute are incorporated into the newly resized window. If there exists a window below, a determination is made as to whether the window below is visible or hidden. If hidden, the system continues to look for a visible window until no further window is found below, at which point the default character and attribute are incorporated into the newly resized window. When a visible window is found below the newly resized window, the character and attribute from its corresponding position are read and incorporated into the newly resized window. This process continues until all of the information is processed from the marked area. In this manner, a window can be enlarged to incorporate the contents of several windows by enclosing several windows in the marked area.

U.S. Pat. No. 5,113,517 to Beard, et al. issued May 12, 1992 and entitled “Concurrent display of data from two different processors each having different display font and user interface for controlling transfer of converted font data therebetween” discloses a multiprocessor system comprising concurrent display of video data reflecting the operation of two processors in discrete portions of a single display screen with a user interface adapted for interaction with both processors. One processor controls the entire display while allocating a portion of the display screen for the use of the other processor which processor emulates a target processor system, for example, the IBM PC. A user interface is represented on the display screen in the form of metaphoric objects, called icons, with which the user can interact by changing the input focus to a designated object by visually pointed to it via the input means, which thereafter permits manipulation of the designated object of interaction with data input/output relative to the designated object. This input means is also used to initially change the input focus to either the allocated emulating processor screen portion or to the remaining portion of the central processor display screen prior to interaction with the metaphoric objects in a selected screen portion, the change of the input focus causing subsequent user input via the input means to be directed to the selected screen portion until interrupted by a change in focus input to the other of the screen portions by the user via the input means. Facilities are also provided to permit transferring of displayed data reflecting the operation of one processor to the control of the other processor in response to user inputs selecting the data to be transferred and indicating the destination of the selected data on the display.

U.S. Pat. No. 5,175,813 to Golding, et al. issued Dec. 29, 1992 and entitled “Window display system and method for creating multiple scrollable and non-scrollable display regions on a non-programmable computer terminal” discloses a windowing system with interface between application programs and non-programmable terminal drivers. The system presents logical windows to the applications program, each of which are represented internally by at least two separate parts. The first part includes the border and non-scrollable text for a logical window, while the second part includes scrollable text for the window. Through calls to the display driver, the windowing system manipulates these separate parts so that they are displayed on the screen as a single window.

U.S. Pat. No. 5,276,437 to Horvath, et al. issued Jan. 4, 1994 and entitled “Multi-media window manager” discloses an apparatus and method for displaying non-obscured pixels in a multiple-media motion video environment (dynamic image management) possessing overlaid windows. In an encoding process, only boundary values and identification values corresponding to each window on a screen are saved in memory of a hardware device. In a decoding process, the hardware device utilizes these initial boundary values saved in memory in such a way that when incoming video data enters the hardware device, the hardware device need only compare the incoming video data's identification with the identification saved in memory. The hardware device includes: compare logic devices, counters, minimal memory devices, a control logic block, and a driver.

U.S. Pat. No. 5,408,602 to Giokas, et al. issued Apr. 18, 1995 and entitled “System and method for emulating a window management environment having a uniform windowing interface” discloses an X window display server providing a virtual window manager client that, from the viewpoint of client programs connected to the server, is indistinguishable from a real window manager client. The emulated window manager is implemented as an internal server client.

U.S. Pat. No. 5,502,839 to Kolnick issued Mar. 26, 1996 and entitled “Object-oriented software architecture supporting input/output device independence” discloses an object-oriented software architecture that interacts with “real” input/output devices exclusively through “virtual” input/output devices. Since all human interface with the operating system is performed through such virtual devices, the system can accept different forms of real input or output devices. The lowest level of the operating system converts input from a physical device to virtual form and converts virtual output into suitable physical output. A number of physical devices can be connected to, removed from, or replaced in the system without disrupting the system.

U.S. Pat. No. 5,522,025 to Rosenstein issued May 28, 1996 and entitled “Object-oriented window area display system” discloses an object-oriented window manager providing coordination between window displays generated by separate application programs by computing and storing the visible area of each application window each time displayed windows are changed. Each application program directly communicates with the screen buffer memory in order to redraw portions of the screen corresponding to its display area using the visible area computed by the window manager. Each application program communicates with the object-oriented window manager by creating a window object which provides display capabilities that are transparent to the application program. Several techniques are used to decrease the visible area computation time. First, a copy of the visible area is stored or “cached” in each window object. This copy can be used if the application program needs to redraw the window area and the visible area has not been changed. In addition, the window manager computes the visible area of each application window utilizing a routine that assumes that only a single window has been changed and compares the new visible area of the window to the old visible area to obtain the change area. This change area is then used to recompute the visible area of all windows which lie behind the changed window.

U.S. Pat. No. 5,564,002 to Brown issued Oct. 8, 1996 and entitled “Method and apparatus for implementing a virtual desktop through window positioning” discloses a virtual desktop system that organizes open applications of a computer into groups of programs that perform common functions or tasks. The groups of programs are called Desktops and the virtual desktop system provides a Desktop Manager for assigning ranges of display screen coordinates to these Desktops, and then assigning open applications to them. Specifically, the Desktop Manager is a system software program that contains a plurality of Desktop groups and that provides a user interface for managing the display of selected open applications assigned to the Desktops. These selected open applications are displayed in application windows on a display screen of the computer when switching between Desktops in the virtual desktop system.

U.S. Pat. No. 5,581,686 to Koppolu, et al. issued Dec. 3, 1996 and entitled “Method and system for in-place interaction with contained objects” discloses a computer method and system for interacting with a containee object contained within a container object. The container object has a container application with a container window environment that has container resources for interacting with the container object. The containee object has a server application with a server window environment with server resources for interacting with the containee object. The invention displays the container window environment on a display device. A user then selects the containee object. In response to selecting the containee object, the system integrates a plurality of the server resources with the displayed container window environment. When a user then selects a server resource, the server application is used to process the server resource selection. Conversely, when a user selects a container resource, the container application is used to process the container resource selection.

U.S. Pat. No. 5,621,879 to Kohda issued Apr. 15, 1997 and entitled “Window management information input/output system” discloses a data processing unit capable of displaying a window on the display screen, ostensibly to refer to and update window management information, that is, information indicating the size and the position of the window, etc. in a representation format comprehensible for a user. It comprises (i) a window selecting unit for selecting a window corresponding to the window management information to be accessed by the user, (ii) a window-management-information-providing unit for inputting to and outputting from the display the management information in the format comprehensible for the user, (iii) a window-management-information-reading unit for reading the management information for the selected window from the window system, converting the representation format of the information, and outputting the result to the window-management-information-providing unit, and (iv) a window-management-information-writing unit for converting the management information converted on the display screen using, for example, a keyboard, and outputted by the window-management-information-providing unit back to the original representation format, and for outputting the result to the window system.

U.S. Pat. No. 5,692,142 to Craycroft, et al. issued Nov. 25, 1997 and entitled “Support for custom user-interaction elements in a graphical, event driven computer system” discloses a system whereby support for so-called “custom gadgets” is provided, at a system software level, in a manner that is essentially application-transparent. Specific support is provided for the addition of one custom gadget per window. The custom gadget is identified by a specific numeric code in the same manner as the close and zoom boxes. An application tells the system software what the custom gadget for a particular window should look like. The code responsible for drawing that window's frame then knows where to find the image of the custom gadget and will render it appropriately. When a user clicks in the custom gadget, the system software notifies the application of the event by means of the numeric code associated with the custom gadget.

U.S. Pat. No. 5,764,230 to Baradel, et al. issued Jun. 9, 1998 and entitled “Window manager suitable for multiple window workstations” discloses a window manager for a windowing system including a window server to command the display on screen of first windows reserved by client programs of the system. The window manager manages the disposition and the circulation of first windows within a second window reserved by the system. The server holds in memory a tree structure of windowing data on the basis of which the window server communicates with the screen window manager and with the client programs. This structure has a root defining the second window and nodes defining corresponding first windows. The window manager manages in the root a first list of identifiers of first windows and detects in each node the presence or the absence of control data. If control data is present in a node defining a particular first window, the window manager manages the disposition and the circulation of the first windows on the basis of second window data under the control of a client program.

U.S. Pat. No. 5,831,609 to London, et al. issued Nov. 3, 1998 and entitled “Method and system for dynamic translation between different graphical user interface systems” discloses a translation software that provides remote access to an application program that is executing on a host machine in its native operating system environment. The translation software monitors messages that are relayed from the application program to an application interface that is provided via the native operating system. Upon recognizing a message that affects a graphical user interface of the native operating system, the translation software converts the message into a protocol that is recognized by a remote graphical user interface. By monitoring and converting messages in this fashion, the translation software allows the application program to be displayed remotely.

U.S. Pat. No. 5,856,826 to Craycroft issued Jan. 5, 1999 and entitled “Method and apparatus for organizing window groups and windows in a table” discloses a method and apparatus for organizing windows to be displayed on a screen of a computer system into window groups by attribute, function, content, or any arbitrary characteristic. A window's membership in a window group is also assigned a status that determines whether the window, upon selection, is displayed individually or as part of that group. Each window may simultaneously belong to a plurality of window groups. A data structure may be formed in a table where windows represent rows and window groups represent columns.

U.S. Pat. No. 5,867,160 to Kraft, I V, et al. issued Feb. 2, 1999 and entitled “System and method for task prioritization in computerized graphic interface environments” discloses a system and method for automatically adjusting priority assigned to execution of applications, tasks, or workspaces to improve performance relative to other such applications, tasks or workspaces in a computerized multitasking graphical user interface environment. A display of a plurality of visual indicators is provided, each of which corresponds to a differing task. By selection of one of the indicators, the priority given to execution of the task is altered as the task is thereby moved into a focused state as a result of such selection. A window manager interposed between a server and application registers in the server the adjusted state of a particular application as being either set in focus or cleared. An application may detect from the server a window-id corresponding to the application for which an adjustment in priority is desired. A mapper function, lookup table, or the like for mapping window-id to a corresponding process-id is obviated as a result of employing messaging/signalling. The amount of CPU resource then directed to the particular application as a result of the priority alteration is thereby in turn altered. In this manner, a focused application is dynamically provided with added CPU resource relative to remaining tasks, applications, or suites thereof associated with a workspace executing in the multitasking environment.

U.S. Pat. No. 5,874,960 to Mairs, et al. issued Feb. 23, 1999 and entitled “Method and system for sharing applications between computer systems” discloses a method in a computer system for displaying data generated by a shared application on a host computer system on both a host display of the host computer system and a shadow display of a shadow computer systems The host computer system has a window manager for managing windows displayed on the host display. The shadow computer system has a window manager for managing windows displayed on the shadow display. Under control of the host computer system, a Share System executes the shared application. Then, the Share System registers a host window with the windowing system of the host computer system. Upon registration of the host window, the Share System sends a notification of registration of the host window to the shadow computer system. At the shadow computer system, the Share System receives the sent notification of registration of the host window. Upon receiving the sent notification of registration of the host window, the Share System registers a shadow window with the windowing system of the shadow computer system so that the window wing system of the shadow computer system can send messages to the shadow window and receive data to display in the shadow window.

U.S. Pat. No. 5,973,702 to Orton, et al. issued Oct. 26, 1999 and entitled “Oriented view system having a common window manager for defining application window areas in a screen buffer and application specific view objects for writing into the screen buffer” discloses an object-oriented view system that controls the display of screen graphics for a plurality of application programs, each of which generates graphical information for display in a window assigned to it. The view system has a system window manager which is common to all of the application programs and which defines application window areas on the display screen and corresponding application window storage areas in the display screen buffer. Each application program instantiates a view system object from class information in the computer operating system. Each view system object includes a view object with program code that directly stores screen display information generated by the application into the screen buffer. This arrangement allows the application programs to ostensibly avoid the conventional “bottleneck” that develops when all of the screen display information must be stored in the screen buffer by the common system window manager.

U.S. Pat. No. 5,995,103 to Ashe issued Nov. 30, 1999 and entitled “Window grouping mechanism for creating, manipulating and displaying windows and window groups on a display screen of a computer system” discloses a window grouping mechanism for creating, organizing and manipulating windows and window groups for display to a user of a computer system. The window grouping mechanism includes a series of linked data structures configured to organize information pertaining to all windows defined by an application program executing on the computer system. The application program interacts with the window grouping mechanism to further organize the information into any number of window groups each of which contains a different subset of the previously defined windows. These window groups may then be manipulated by the application program to efficiently create various permutations of window groups.

U.S. Pat. No. 6,219,044 to Ansberry, et al. issued Apr. 17, 2001 and entitled “Method for managing top-level windows within a conferencing network system” discloses a method and system for managing top-level windows controlled by a conference enabler is disclosed. The system operates in a conferencing network system having a conference enabler for distributing applications to a plurality of servers. Each server has its own display. The method and system identifies a top-level window sent by the conferenced application. Next, it identifies whether a top-level window is among the requests sent by the conferenced application is a root window. The system then enters a window ID associated with the top-level window into a list of top-level windows. Then, the system provides a slot associated with the top-level window within the list for storing the window configuration of the top-level window as configured by each of the participant servers.

U.S. Pat. No. 6,397,262 to Hayden, et al. issued May 28, 2002 and entitled “Window kernel” discloses a system for managing the interaction of programs, comprising (i) means for storing a set of predetermined characteristics respecting each program to be managed, each set of characteristics including an input signal type characteristic indicative of the identity of the type of inputs signals to which the program associated with the set of characteristics, is responsive and a signal modification characteristic indicative of whether a type of input signal is to be modified by the associated program; (ii) means responsive to input signals having predetermined properties emitted from one of the programs for interrogating each set of predetermined characteristics in a predetermined sequence, determining whether the associated program is responsive to a current input signal, determining whether the properties of the current input signal are to be modified and, if so, modifying the properties of the input signal; and (iii) means for emitting an output signal to the programs determined to be responsive to the input signal.

United States Patent Application Publication 20020009149 to Rodriguez, et al. published Jan. 24, 2002 and entitled “System and method for adaptive video processing with coordinated resource allocation” discloses a system and method for adaptive video decoding. The method for adaptive video decoding includes determining whether a resource constrained mode is to be initiated, and responsive to a determination that the resource constrained mode is to be initiated, initiating the resource constrained mode, including foregoing the decoding of portions of received video input. For example, adaptive video decoding may include foregoing the decompression and reconstruction of selected video frames during intervals of high demand for memory and/or bus bandwidth resources.

United States Patent Application Publication 20020049978 to Rodriguez, et al. published Apr. 25, 2002 and entitled “System and method for access and placement of media content information items on a screen display with a remote control device” discloses a system and method for providing interactive media services in a subscriber network television system. The system receives a first user input from a remote control device indicating a user's desire to select an item of media content information displayed in a user interface on a screen; and receives a second user input from the remote control device indicating a user's desire to drag the item of media content information to a screen destination.

United States Patent Application Publication 20020052977 to Stall published May 2, 2002 and entitled “Method and apparatus for adapting and hosting legacy user interface controls” discloses a method and apparatus for adapting and hosting legacy user interface controls. Legacy user interface controls are exposed within a new window manager as native user interface objects. A bridge between a hosted legacy user interface control and the legacy window manager intercepts messages intended for the hosted user interface control. The messages are filtered to determine if they should be passed to the new window manager. If a message is to be forwarded, the message is forwarded to a root “Visual Gadget” in the new window manager. The message is processed and routed down the window tree to an adapter control for hosting the legacy user interface control. The adapter control processes the message and routes the message to any listener objects attached to the adapter. If the message has not been completely handled, the message is “bubbled” up the window tree to the parent objects of the adapter control for additional processing.

United States Patent Application Publication 20020112090 to Bennett, et al. published Aug. 15, 2002 and entitled “Method, system, and product for a java-based desktop to provide window manager services on UNIX” discloses a window manager proxy method, system, and product allowing a Java based desktop to provide window manager services on UNIX. A computer system executes a UNIX-based operating system and a desktop implemented in Java. The computer system does not include a separate window manager. Java applications are presented by the computer system utilizing a graphical user interface. Native UNIX applications are also presented by the computer system utilizing the same graphical user interface. Native UNIX applications interact with the window manager proxy in the same manner in which they would interact with a traditional window manager. The window manager proxy forwards frame window activity related to the desktop to the Java desktop, and is the native interface from the Java desktop to the native platform for frame window activities. Native UNIX applications, Java applications, and the Java desktop are thus rendered and managed in a consistent manner providing the end user with the look and feel as configured within the Java desktop.

United States Patent Application Publication 20020126144 to Chenede, published Sep. 12, 2002 and entitled “Apparatus and method for communicating graphical display data in a network-based windowing system” discloses apparatus and methods of communicating graphical display data in a network-based windowing system are disclosed. An interface is operable to permit direct access between an application and a window manager, where the window manager is responsible for controlling window layout within at least one workspace in accordance with predefined rules. The interface is operable to provide at least one control module for controlling communication between the application and the window manager and at least one repository of data to be communicated between an application and, the window manager. Such an interface enables the provision of a flexible and extensible approach to communicating between an application and a window manager. Such an interface can readily be implemented as an extension to a conventional windowing system.

United States Patent Application Publication 20020191028 to Senechalle, et al. published Dec. 19, 2002 and entitled “Window manager user interface” discloses a window manager having a frame window, with one or more pane windows. Each pane window has a viewing area that is used to display an application. If the application running in the viewing area cannot be fully viewed, a scroll bar and scroll keys are provided to enable the user to scroll through the entire application. The user can quickly and easily create and remove pane windows within the frame window. Pane windows are created by splitting an existing pane window either vertically or horizontally, with the two new split pane windows occupying the space of the original pane window. When a pane window is closed, one or more of the remaining pane windows are maximized to occupy its space. Accordingly, the window manager enables the pane windows to be dynamically and simultaneously presented to a user. The pane windows do not interfere with one another, and are arranged to maximize the space available in that frame window.

United States Patent Application Publication 20030081664 to Lu, et al. published May 1, 2003 and entitled “Transmit and receive window synchronization” discloses a system for synchronizing sender sliding windows and receiver sliding windows employed in wireless packet communication. The sender sliding window buffers outgoing packets to be sent to a receiver that employs a receiver sliding window to buffer incoming packets. A sender window manager manages the sender sliding window through positive acknowledgement, negative acknowledgement and/or timeout processing to facilitate synchronizing the sender sliding window with the receiver sliding window without employing synchronization messages or master/slave control. Similarly, a receiver window manager manages the receiver sliding window through sequence number analysis to facilitate synchronizing the receiver sliding window with the sender sliding window without employing synchronization messages or master/slave control.

United States Patent Application Publication 20030107604 to Ording published Jun. 12, 2003 and entitled “Method and system for automatic window resizing in a graphical user interface” discloses a method and system for automatically resizing a window displayed within a display area in a graphical user interface environment. Exemplary embodiments of the present invention detect that at least a portion of the window is being dragged between a region inside of the display area and a region outside of the display area. Upon detection, the window is resized while being dragged. The resized window can be redrawn so that the frame of the resized window is displayed in the region inside of the display area.

United States Patent Application Publication 20030181241 Oakes, et al. published Sep. 25, 2003 and entitled “System and method for effectively implementing remote display devices in a gaming network” discloses a system and method for implementing remote display devices in a gaming network, which may include a game console configured to generate game program signals corresponding to a gaming event, and a base unit coupled to the game console for processing the game program signals to produce a game program bitstream. The base unit may then wirelessly transmit the game program bitstream to various remote units which may each be configured to receive the game program bitstream and responsively process the game program bitstream to retrieve the foregoing game program signals. The remote units may then each perform a pixel identification procedure to individually identify different assigned windows from the game program signals. The remote units may also each perform a window zooming procedure to generate remote display video signals corresponding to the assigned windows. The remote units may then each advantageously display one of the remote display video signals in a substantially full-screen manner upon respective remote displays coupled to the remote units.

Various PC-oriented windowing programs exist, including for example the ubiquitous Microsoft Windows® operating system manufactured by Microsoft Corporation, and the MAC O/S (X) offered by Apple Computer Corp. These systems are exemplary of PC or hand-held device operating systems adapted to run multiple applications simultaneously, and manage UI or display windows accordingly. For instance, the recently introduced Apple Exposë system utilizes virtual and protected memory to allow multiple applications to remain open at the same time without having data loss in other applications if one program “crashes”. The Exposë system can manage several documents open per application, allowing the user to see all open windows at once, and then switch to the desired window. Alternatively, only the windows of the current program can be displayed.

Despite the broad variety of techniques, the foregoing prior art does not disclose an adequate display element (e.g., window) managing approach which is specifically adapted to digital television environments and their unique set of user input, display, and application harmonization issues. This is particularly acute with respect to the newly developed HAVi environment, which provides a markedly different architecture and issues than those of the prior art, yet provides no elegant solution for cross-application window coordination or management.

Accordingly, there is a need for improved apparatus and methods for providing application display element management and control within, e.g., CATV/HFC networks. These improved apparatus and methods would meet these needs while also enabling compliance with industry standard requirements within the network.

SUMMARY OF THE INVENTION

The present invention addresses the foregoing needs by disclosing an improved display element manager apparatus and associated methods for use in content-based networks.

In a first aspect of the invention, improved CPE adapted for connection to a network is disclosed. The CPE has a plurality of applications running thereon and comprises a display element manager adapted to control the overlapping of two or more display elements between the applications; and provide for control of at least one display element by a privileged application running on the CPE. In one exemplary embodiment, the display elements each comprise display windows, and at least some of the applications are bound to one or more channels or service providers.

In a second aspect of the invention, an improved display element manager adapted for use on a client device within a cable network is disclosed. In one exemplary embodiment, the display element manager comprises a software process stored at least in part on a storage device associated with the client device, and is operative to selectively control the overlapping of two or more display elements between two or more applications running on the client device; and selectively reserve at least portions of a display area associated with the client device to prevent interference between display elements associated with one or more of said applications.

In a third aspect of the invention, an improved “environment agnostic” client device for use within a cable network is disclosed. The improved device generally comprises a plurality of applications including a privileged application operating thereon, with the privileged application being operative to selectively control a plurality of display elements associated with at least one of the plurality of applications irrespective of the application environment thereof. In one exemplary embodiment, the application environment comprises a HAVi environment, and the privileged application comprises an OCAP monitor application. The device also includes a display element manager having a visibility stack which orders HAVi HScenes associated with each of the applications.

In a fourth aspect of the invention, a method of remotely controlling one or more display elements adapted for display on a display device located at premises is disclosed. In one exemplary embodiment, the display device being operatively coupled to a network device such as a DSTB adapted to run at least one application program and communicate with a remote node, the method comprising: (i) providing a display manager having a display management component associated therewith, the display manager running on the network device; and accessing the management component from said remote node. The display manager comprises a software process resident on the network device and includes a visibility stack which maintains display elements associated with the applications running on the device. The remote node (e.g., head-end) can gain access to the stack via the network, and reorder the stack or otherwise control its operation remotely, such as to change display priorities for bound applications.

In a fifth aspect of the invention, an improved method of operating a network device adapted to run a plurality of application programs and communicate with a remote node is disclosed. The method generally comprises: receiving at the network device a signal from the remote node, the signal being adapted to designate at least one of the plurality of applications as privileged; designating, based on the signal, at least one of the plurality of applications as privileged; and selecting, using the privileged application, at least one other application to be given focus within the device. In one embodiment, the network device comprises an OCAP-compliant DSTB, and the designated privileged application comprises an OCAP monitor application. Selecting an application to be in focus comprises altering the location of information relating to that application within a visibility management component (e.g., stack) resident on the network device.

These and other aspects of the invention shall become apparent when considered in light of the disclosure provided below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a functional block diagram illustrating an exemplary HFC network configuration useful with the present invention.

FIG. 1 a is a functional block diagram illustrating one exemplary head-end configuration of an HFC network useful with the present invention.

FIG. 2 is a logical block diagram illustrating one exemplary embodiment of the display element manager according to the invention, showing its interactions with other components.

FIG. 2 a is a graphical representation of an exemplary visibility stack used with the display element manager of FIG. 2.

FIG. 2 b is a logical flow diagram illustrating an exemplary method of determining applications for visibility/hiding within the stack of FIG. 2 a.

FIG. 2 c is a graphical representation of an exemplary visibility stack used with the display element manager, the stack having a suite of associated applications relating to the in-focus application.

FIG. 2 d is a graphical representation of an exemplary visibility of FIG. 2 c, the suite having a fixed offset from the in-focus application.

FIG. 3 is a logical flow diagram illustrating an exemplary method of progressively allocating window overlap according to the invention.

FIG. 3 a is a graphical representation of exemplary windowed screen displays generated by the window manager of the present invention, illustrating various levels of encroachment or overlap by multiple windows.

FIG. 4 is a logical flow diagram illustrating an exemplary embodiment of the method of generating display elements according to the invention.

FIG. 5 is a functional block diagram of exemplary CPE having the improved error logging and management system.

DETAILED DESCRIPTION OF THE INVENTION

Reference is now made to the drawings wherein like numerals refer to like parts throughout.

As used herein, the term “display element” refers to any user interface (UI) or other structure adapted to be displayed on a display device including without limitation windows, icons, objects, “tickers” or menus.

As used herein, the term “HAVi” refers generally to the family of Home Audio Video Interoperability specifications for, e.g., consumer electronics including without limitation HAVi Version 1.1.

As used herein, the phrase “the implementation” refers to an implementation of a standard or other system that adopts GEM (e.g., OCAP, ACAP, MHP) an implicitly includes the HAVi user interface (UI). The implementation comprises, without limitation, all of the logic that executes below or within the API sets of the system.

As used herein, the term “application” refers generally to a unit of executable software that implements theme-based functionality The themes of applications vary broadly across any number of disciplines and functions (such as e-commerce transactions, brokerage transactions, mortgage interest calculation, home entertainment, calculator etc.), and one application may have more than one theme. The unit of executable software generally runs in a predetermined environment; for example, the unit could comprise a downloadable Java Xlet™ that runs within the JavaTV™ environment.

As used herein, the term “computer program” is meant to include any sequence or human or machine cognizable steps which perform a function. Such program may be rendered in virtually any programming language or environment including, for example, C/C++, Fortran, COBOL, PASCAL, assembly language, markup languages (e.g., HTML, SGML, XML, VoXML), and the like, as well as object-oriented environments such as the Common Object Request Broker Architecture (CORBA), Java™ (including J2ME, Java Beans, etc.) and the like.

As used herein, the term “middleware” refers to software that generally runs primarily at an intermediate layer in a software or protocol stack. For example, middleware may run on top of an operating system and platform hardware, and below applications.

The term “component” refers generally to a unit or portion of executable software that is based on a related set of functionalities. For example, a component could be a single class in Java™ or C++. Similarly, the term “module” refers generally to a loosely coupled yet functionally related set of components.

As used herein, the term “process” refers to executable software that runs within its own CPU environment. This means that the process is scheduled to run based on a time schedule or system event. It will have its own Process Control Block (PCB) that describes it. The PCB will include items such as the call stack location, code location, scheduling priority, etc. The terms “task” and “process” are typically interchangeable with regard to computer programs.

A server process is an executable software process that serves various resources and information to other processes (clients) that request them. The server may send resources to a client unsolicited if the client has previously registered for them, or as the application author dictates.

As used herein, the term “DTV Network Provider” refers to a cable, satellite, or terrestrial network provider having infrastructure required to deliver services including programming and data over those mediums.

As used herein, the terms “network” and “bearer network” refer generally to any type of telecommunications or data network including, without limitation, hybrid fiber coax (HFC) networks, satellite networks, telco networks, and data networks (including MANs, WANs, LANs, WLANs, internets, and intranets). Such networks or portions thereof may utilize any one or more different topologies (e.g., ring, bus, star, loop, etc.), transmission media (e.g., wired/RF cable, RF wireless, millimeter wave, optical, etc.) and/or communications or networking protocols (e.g., SONET, DOCSIS, IEEE Std. 802.3, ATM, X.25, Frame Relay, 3GPP, 3GPP2, WAP, SIP, UDP, FTP, RTP/RTCP, H.323, etc.).

As used herein, the term “head-end” refers generally to a networked system controlled by an operator (e.g., an MSO or multiple systems operator) that distributes programming to MSO clientele using client devices. Such programming may include literally any information source/receiver including, inter alia, free-to-air TV channels, pay TV channels, interactive TV, and the Internet. DSTBs may literally take on any configuration, and can be retail devices meaning that consumers may or may not obtain their DSTBs from the MSO exclusively. Accordingly, it is anticipated that MSO networks may have client devices from multiple vendors, and these client devices will have widely varying hardware capabilities. Multiple regional head-ends may be in the same or different cities.

As used herein, the terms “client device” and “end user device” include, but are not limited to, personal computers (PCs) and minicomputers, whether desktop, laptop, or otherwise, set-top boxes such as the Motorola DCT2XXX/5XXX and Scientific Atlanta Explorer 2XXX/3XXX/4XXX/8XXX series digital devices, personal digital assistants (PDAs) such as the Apple Newton®, “Palm®” family of devices, handheld computers such as the Hitachi “VisionPlate”, personal communicators such as the Motorola Accompli devices, Motorola EVR-8401, J2ME equipped devices, cellular telephones, or literally any other device capable of interchanging data with a network.

Similarly, the terms “Consumer Premises Equipment (CPE)” and “host device” refer to any type of electronic equipment located within a consumer's or user's premises and connected to a network. The term “host device” refers generally to a terminal device that has access to digital television content via a satellite, cable, or terrestrial network. The host device functionality may be integrated into a digital television (DTV) set. The term “consumer premises equipment” (CPE) includes such electronic equipment such as set-top boxes, televisions, Digital Video Recorders (DVR), gateway storage devices (Furnace), and ITV Personal Computers.

As used herein, the term “network agent” refers to any network entity (whether software, firmware, and/or hardware based) adapted to perform one or more specific purposes. For example, a network agent may comprise a computer program running in server belonging to a network operator, which is in communication with one or more processes on a CPE or other device.

As used herein, the term “DOCSIS” refers to any of the existing or planned variants of the Data Over Cable Services Interface Specification, including for example DOCSIS versions 1.0, 1.1 and 2.0. DOCSIS (version 1.0) is a standard and protocol for internet access using a “digital” cable network. DOCSIS 1.1 is interoperable with DOCSIS 1.0, and has data rate and latency guarantees (VoIP), as well as improved security compared to DOCSIS 1.0. DOCSIS 2.0 is interoperable with 1.0 and 1.1, yet provides a wider upstream band (6.4 MHz), as well as new modulation formats including TDMA and CDMA. It also provides symmetric services (30 Mbps upstream).

The term “processor” is meant to include any integrated circuit or other electronic device (or collection of devices) capable of performing an operation on at least one instruction including, without limitation, reduced instruction set core (RISC) processors, CISC microprocessors, microcontroller units (MCUs), CISC-based central processing units (CPUs), and digital signal processors (DSPs). The hardware of such devices may be integrated onto a single substrate (e.g., silicon “die”), or distributed among two or more substrates. Furthermore, various functional aspects of the processor may be implemented solely as software or firmware associated with the processor.

Overview

As previously discussed, network standards such as the HAVi specification often do not specify or provide a mechanism for cross-application display element (e.g., window) management. For example, HAVi states that any system using HAVi should define a “home navigation shell” if any window management rules beyond the base HAVi definition are required. HAVi specifies z-ordering and other window management aspects within an application, but does not describe or specify cross-application management. In systems that run disjoint applications concurrently and where each application may display windows, such cross-application windows management is of particular importance.

The present disclosure addresses these shortcomings by defining a cross-application display element management system for, e.g., HAVi/OCAP compliant devices, and more generally useful with most any element or window management system. The exemplary manager disclosed herein advantageously provides the following features and aspects which are not offered by basic HAVi or other similar specifications: (i) control of overlapping windows between applications; (ii) application reservation of screen real estate to prevent overlay by other applications; and (iii) control of window management aspects by a privileged application.

Notably, by providing the ability to allow a privileged application to control the element management system, the present invention may be broadly applied to any number of different application environments (including HAVi).

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Exemplary embodiments of the apparatus and methods of the present invention are now described in detail. While these exemplary embodiments are described in the context of the aforementioned hybrid fiber coax (HFC) cable system architecture having a multiple systems operator (MSO), digital networking capability, and plurality of client devices/CPE, the general principles and advantages of the invention may be extended to other types of networks and architectures, whether broadband, narrowband, wired or wireless, or otherwise, the following therefore being merely exemplary in nature.

It will also be appreciated that while described generally in the context of a consumer (i.e., home) end user domain, the present invention may be readily adapted to other types of environments (e.g., commercial/enterprise, government/military, etc.) as well. Myriad other applications are possible.

Lastly, although described specifically with regard to windows, it will be appreciated that the invention may be readily extended to other types of display elements.

FIG. 1 illustrates a typical network component configuration with which the window manager apparatus and methods of the present invention may be used. The various components of the network 100 include (i) one or more application origination points 102; (ii) one or more distribution servers 104; and (iii) consumer premises equipment (CPE) 106. The distribution server(s) 104 and CPE(s) 106 are connected via a bearer (e.g., HFC) network 101. A simple architecture comprising one of each of the aforementioned components 102, 104, 106 is shown in FIG. 1 for simplicity, although it will be recognized that comparable architectures with multiple origination points, distribution servers, and/or CPE devices (as well as different network topologies) may be utilized consistent with the invention. For example, the head-end architecture of FIG. 1 a (described in greater detail below) may be used.

The application origination point 102 comprises any medium that allows an application to be transferred to a distribution server 104. This can include for example an application vendor website, CD-ROM, external network interface, mass storage device (e.g., RAID system), etc. Such transference may be automatic, initiated upon the occurrence of one or more specified events (such as the receipt of a request packet or ACK), performed manually, or accomplished in any number of other modes readily recognized by those of ordinary skill.

The distribution server 104 comprises a computer system where one or more applications can enter the network system. Distribution servers are well known in the networking arts, and accordingly not described further herein.

The CPE 106 includes any equipment in the “consumers' premises” (or other locations, whether local or remote to the distribution server 104) that can be accessed by a distribution server 104. Such CPEs 106 comprise processors and associated computer memory adapted to store and run the downloaded or resident application. In the present context, at least a portion of the application is typically downloaded to the CPE 106, wherein the latter executes the downloaded application(s)/components, although it will be recognized that all of applications may conceivably be uploaded to the server, or alternatively transferred to another device, such as other networked CPE or the like. Applications may be (i) “pushed” to the CPE (i.e., wherein the distribution server causes the application download to occur), (ii) “pulled” to the CPE (i.e., where the CPE causes the download), (iii) downloaded as the result of some third entity or device (such as a remote server); (iv) resident on the CPE at startup; or (v) combinations of the foregoing.

Referring now to FIG. 1 a, one exemplary embodiment of the network head-end architecture useful with the invention is described. As shown in FIG. 1 a, the head-end architecture 150 comprises typical head-end components and services including billing module 152, subscriber management system (SMS) and CPE configuration management module 154, cable-modem termination system (CMTS) and OOB system 156, as well as LAN(s) 158, 160 placing the various components in data communication with one another. It will be appreciated that while a bar or bus LAN topology is illustrated, any number of other arrangements as previously referenced (e.g., ring, star, etc.) may be used consistent with the invention. It will also be appreciated that the head-end configuration depicted in FIG. 1 a is high-level, conceptual architecture and that each MSO may have multiple head-ends deployed using custom architectures.

The architecture 150 of FIG. 1 a further includes a multiplexer/encrypter/modulator (MEM) 162 coupled to the HFC network 101 adapted to “condition” content for transmission over the network. In the present context, the distribution servers 104 are coupled to the LAN 160, which provides access to the MEM 162 and network 101 via one or more file servers 170. In the typical HFC network, information is carried across multiple channels. Thus, the head-end must be adapted to acquire the information for the carried channels from various sources. Typically, the channels being delivered from the head-end 150 to the CPE 106 (“downstream”) are multiplexed together in the head-end and sent to neighborhood hubs (not shown).

Content (e.g., audio, video, etc.) is provided in each downstream (in-band) channel. To communicate with the head-end, the CPE 106 uses the out-of-band (OOB) DAVIC or DOCSIS channels and associated protocols. The OCAP 1.0 specification provides for networking protocols both downstream and upstream. To distribute files and applications to the CPE 106, the files and applications are configured as data and object carousels and may be sent in both the in-band and OOB channels. As is well known in the art, a carousel may be viewed as a directory containing files. The files of the carousel utilized herein are sent in a continuous round-robin fashion. If the client device misses a desired or necessary file in one carousel transmission, it can wait for the next. Alternatively, in another embodiment, the CPE portion of the application is configured as part of the program content on a given in-band, DAVIC, or DOCSIS channel. As yet another embodiment, the CPE portion is downloaded directly using IP (Internet Protocol) packet traffic in an Out-Of-Band DAVIC or DOCSIS channel. Note that the file carousel or other device providing the application to the CPE 106 via the aforementioned communication channels may be the distribution server 104 previously described, or alternatively a separate device which may or may not be physically co-located with the server (e.g., remote file servers 170 of FIG. 1 a). For example, a remote file storage device (not shown) with carousel capability may be in data communication with the client device(s) via an out-of-band communications channel as described below, the download of the application files from the remote device being initiated by way of a query from the client device, or alternatively a signal generated by the server 104 and transmitted to the remote device. Many other permutations of the foregoing system components and communication methods may also be used consistent with the present invention, as will be recognized by those of ordinary skill in the field.

Display Element Management

Referring now to FIG. 2, a first exemplary configuration of the display element (e.g., window) manager apparatus of the present invention is described. In the exemplary embodiment, the window manager comprises a computer program or module 202 running on the CPE 106 and adapted to communicate with other applications 204 running on the device 106. The window manager 202 also communicates with, or is the OCAP monitor application 206 running on the CPE, the monitor application being in communication with the head-end 150 or another network agent 210 (e.g., software process or entity) on the network. In this fashion, the head-end and/or network agent can deliver applications (or suites of applications, as described below) to the CPE 106 which can then be coordinated or managed by the window manager 202 during operation of the applications.

In general, there are three approaches to implementing the display of windows associated with multiple applications by the window manager 202; (i) allow a single application at a time to display its window component(s); (ii) allow multiple applications to display windows concurrently, but do not allow overlapping windows between applications (i.e., paned windowing only); or (iii) allow multiple applications to display windows concurrently and allow windows between the applications to overlap. As previously discussed, the HAVi specification permits and controls overlapping of windows within a given single application, but does not address cross-application window management.

Accordingly, the window manager 202 controls the management of (overlapping) windows between two or more applications operating within the relevant software environment. In the exemplary embodiment, a “visibility stack” 230 (FIG. 2 a) is maintained by the window manager 202, which indicates those applications 204 which have created a HAVi window hierarchy. In the exemplary embodiment, the HAVi HScene object instances for each application are maintained in the stack. The implementation keeps track of the components in each scene so that information is not needed in the scene stack; however, the implementation is free to keep additional information in the stack if desired. In addition, some information regarding which application has focus is maintained because there are handling rules regarding allowed changes by an application acting as window manager once a consumer has selected an application and caused it to acquire focus. Hence, the window manager 202 is in the illustrated embodiment HAVi specific; only those applications for which a HAVi hierarchy has been created are managed by the stack 230. However, it will be appreciated that in general, any windowing system that associates components with an application could utilize the techniques described herein. It will also be appreciated that while the exemplary stack 230 comprises a virtual rendition maintained in software by the window manager 202, other mechanisms for maintaining the stack 230 may be used including, for example, designating specific regions of memory in the CPE 106 as portions of the stack based on, e.g., address.

Furthermore, the stack 230 need not be maintained physically on the CPE 106, but rather may be stored by another network agent or even the head-end, such as in a file accessible to the CPE/window manager. This approach may be used, e.g., for saving state of the stack, and for use with a distributed window manager that has a portion running in a server.

Additionally, the present invention contemplates the ability of the head-end 150 or a network agent to access the stack 230 maintained on the CPE 106 by the window manager 202 to, e.g., manipulate the stack remotely. For example, where the MSO or other head end process wishes to dynamically change the window display of one or more CPE 106 on the network, they can in effect re-order the stack (including using information sent to the head-end by the window manager 202, such as via OOB channel, for such purpose).

Furthermore, the head-end or agent can also designate (or re-designate) a given application as “privileged”, thereby giving it the ability to select other applications to be given focus, as discussed below.

In the exemplary embodiment, a primary factor used when determining the order of applications within the visibility stack 230 is focus. Specifically, at the top 232 of the stack list 230 is that application that is currently “in focus”. An application gains focus when one of the following occurs; a) the consumer directly or indirectly selects it, such as via their remote control, b) the application requests focus using the Java AWT Component requestFocus method and gets it, or c) a privileged application (or its proxy) requests that another application gets focus, and that application gets it. Beneath the in-focus application 232, the order of applications in the visibility stack list 230 can be determined by several factors including but not limited to (i) the historical order in which they were selected by the consumer (e.g., the farther back in time they were selected, the lower on the list 230 they will appear); and (ii) re-ordering of the list by a privileged application or other entity with permission to reorder.

With respect to re-ordering, a privileged application or other entity (e.g., head-end or network agent) may re-order applications below the in-focus application based on proprietary criteria, such as for example the importance of applications within a network. Importance may be designated in an absolute or relative sense, such as via a numerical value or sequence order, or even according to a fuzzy logic variable (e.g., “high”, “moderate”, or “low”). Importance can also be made conditional upon one or more other parameters, such as for example time of day, customer subscription status, etc. Other approaches may be used as well.

In the exemplary configuration, the in-focus application must remain at the top of the stack 230; however, this is not an immutable condition. Specifically, the present invention also contemplates the condition where the in-focus application is not required to be left at the top of the stack. For example, a privileged application (e.g., network agent), may request that the implementation give focus to a different application. Furthermore, if a consumer has not yet selected an application, or an application specifically selected by a consumer has been de-selected by the consumer (i.e., minimize, quit, exit, or similar was selected), then choice of focus transfers to the implementation and focus requests can be considered by the system for designation of the “top-level” stack application.

Additionally, windows for some of the managed applications may be optionally or selectively hidden. In one exemplary embodiment (FIG. 2 b), a configuration selection function is provided that specifies one or more parameters affecting window display; e.g., a user or programmer can specify a parameter “n” corresponding to the maximum number of applications that can display windows simultaneously. If there are more applications displaying windows (n_(d)) than this parameter n allows for (i.e., n_(d)>n), applications are hidden according to a priority scheme until this parameter is satisfied; i.e., until n_(d)≦n. In one exemplary scheme, application windows are hidden starting from the bottom of the visibility stack and working upwards in stack position; i.e., lowest priority hidden first, next lowest hidden next, and so forth.

In another variant, applications are hidden according to a predetermined hierarchy which is contained within a file resident within the system (e.g., managed by the OCAP monitor application on the CPE). This hierarchy may be dynamically altered, such as through downloading of a new hierarchy file from, e.g., an external source via in-band or OOB channel, or other means.

Alternatively, the hierarchy may be dynamically determined by the OCAP monitor application or other entity resident on the CPE (including the window manager 202). For example, the relevant entity may evaluate one or more parameters associated with each of the applications within the stack 230 (or just those within the lower portion of the stack that are relevant to the “hiding” determination) in order to assemble a hierarchy. In one embodiment, these application parameters comprise an estimated resource allocation for each relevant application; those requiring more or less resources can be disposed at a higher or lower window display priority within the hierarchy. Alternatively, application type can be used as the basis for prioritization; e.g., frequently used user-interactive applications could be placed higher in the stack, with configuration or similar “background” applications being relegated to the bottom of the stack. Frequency of use can also be a determinant in this process; i.e., the stack can be dynamically allocated according to periodic or opportunistic updates based on recent usage (e.g., time of use, number of invocations of that application, etc.). Myriad other types of schemes can be used as well.

It will also be recognized that the “hiding” variable (e.g., n) can be dynamically varied or determined. While the foregoing examples assume a static value of n, alternate embodiments of the invention permit n or other similar parameters to be selected based on extrinsic information, such as the configuration of the CPE on which the application window manager 202 is running (e.g., model/type, available CPU or memory resources), the total number of applications running (e.g., n is selected so as to maintain a certain percentage of the running applications hidden), or even information relating to components or entities at other locations on the network (such as the head-end 150 or a third-party content provider).

In the context of HAVi, an application is permitted to request focus for a component. Getting focus in this manner makes the application's window components visible, and places them over the components of other applications within the stack 230. In addition, the in-focus application is placed at the top 232 of the application visibility stack.

In addition to the basic HAVi focus concept described above, the present invention advantageously provides for the creation or identification of one or more application groups or suites (see discussion of Appendix I provided subsequently herein). Specifically, this feature allows multiple (e.g., two or more) applications to be associated. It is noted that HAVi maintains relationships between components (per application). Hence, applications in a suite can share associations between their suites, but components from different scenes are not interspersed. When a scene is moved in the stack, all of its components are moved with it. This approach is used because (i) it eliminates contention in that all components are owned by a single application, and that application knows their context; and (ii) interspersing of components of different applications would make the rendered display confusing unless the applications were programmed to communicate very closely. However, such close level of communications also makes the functionality of the applications very similar, and hence the functionality is more efficiently disposed within a single application. In addition, because of the nature of the walled gardens, applications running within in an OCAP implementation require significant overhead when communicating with other applications.

The foregoing associations may be purely functional and not based on any other criteria, or alternatively may be defined according to a higher level logical or association scheme. For example, all of the applications associated in a given group or suite may bear no logical or other relationship to one another, their only common attribute being linkage via the association mechanisms described herein. Alternatively, the applications within the group may be related by one or more attributes, such as common theme, common size, common resource requirements, a given service provider or content channel, etc. Furthermore, interrelationships between activities called within one application may be the basis of grouping, such as where on application potentially or necessarily invokes another application when running. A plethora of other types of relationships can be used as the basis for grouping according to the present invention.

In one exemplary configuration, the applications within a group or suite 236 are linked such that when one application 232 is given focus, other applications 240 within that suite 236 can be placed directly underneath it in the visibility stack 230 (FIG. 2 c). This is accomplished by simply moving the associated applications up from their current locations if necessary. The ordering of the associated applications does not change except when the focused application changes, and is moved on top of the others. Generally, all applications in the associated suite will be within the visible (i.e., non-hidden) portion of the stack 230; however, this is not a prerequisite. For example, some suites may contain “background” applications which run yet which only have a lower display priority.

When focus is given to a new application and the application is already part of the focused suite 236, the only change is moving the application to the top of the visibility stack. When focus is changed and the application getting the focus is not in the focused suite 236, then the entire suite is moved in the visibility stack.

Additionally, the linking described above is not limited to placement in the stack 230 of the linked (non-focus) applications directly below the in-focus application 232. For example, various schemes can be applied, such as fixed offset placement (i.e., where the linked non-focus applications are placed beginning or ending with a fixed offset from the in-focus application, as shown in FIG. 2 d), conditional placement (i.e., where one or more other criteria are evaluated as a condition precedent to reorganizing the stack), or placement of the linked applications directly below or with an offset according to a hierarchy ranking (i.e., where one or more non-linked application may have a higher hierarchy than at least one of the linked applications). Any number of different linking schemes can be used with the invention, as will be recognized by those of ordinary skill in the software programming arts.

Application Reservation of Screen Real-Estate

As is known, HAVi allows for components within an application to request certain portions of the display screen. However, applications that are not properly associated may overlap each other's components in a fashion not controllable by HAVi. This may be undesirable, for example, when one application is a ticker, menu bar, or the like that a user wishes to expose at all times. Accordingly, in another aspect of the window manager of the resent invention, a mechanism is provided whereby applications running within the system (e.g., CPE) can reserve screen real estate that can never be overlapped, or alternatively can only be overlapped according to certain criteria. These criteria include, for example, circumstances where: (i) the reservation is made only against applications not in the reserving application's suite or linkages (i.e., conditional reservation based on group or suite membership); (ii) user-specified overrides of the general preemption of no overlapping of windows (e.g., where the user directly or indirectly selects an option within an application that overrides the exclusive reservation); and/or (iii) emergency alert messages. These two modes, i.e., “never overlapping” or “conditionally overlapping” can also be implemented such that they can be selected by the user (such as via a configuration menu) or alternatively reserved for programmer or even head-end/MSO control.

As will be appreciated, the exclusive reservation of screen real-estate consumes some fraction (or even all) of a finite resource in a mutually exclusive fashion and should be exercised with care. Accordingly, the window management system of the present invention can also be implemented with innate “intelligence” in this regard; e.g., dynamically permitting either exclusive reservation or conditional reservation as a function of system hardware and/or software parameters. In one variant, the window manager monitors resources available within the CPE or other user device in order to enable exclusive reservation; where available resources are depleted beyond a predetermined (or dynamic) threshold, the window manager will automatically disable exclusive reservation and enforce conditional reservation in an effort to conserve the depleted resource(s).

Additionally, the transition from exclusive to conditional reservation need not be binary in nature, but rather can also be implemented in a progressive manner; e.g., increasing the allowed degree of encroachment of one application's window onto the real estate of another (reserving) application when resources are limited. For example, in one embodiment (FIG. 3), the window manager is adapted to (i) determine the available or remaining resource level(s) per step 302, (ii) determine the portion of the depletion fraction of the measured resource(s) attributable to application exclusive reservations (step 304), and (iii) allocate the remaining portion of the resource(s) according to an allocation scheme (step 306). In one variant, the allocation scheme comprises a simple proportional allocation; i.e., the new (requesting) application is allocated real estate, or allowed to encroach, in direct proportion to the level of the resource used, as reflected in the exemplary relationship of Eqn. (1): E _(e)α(100−L _(r))  Eqn. (1) Where:

-   -   E_(e)=Allowed encroachment of requesting application (percent of         resource reserved by reserving application); and     -   L_(r)=Level of un-reserved remaining resource(s) as a percent of         total.         Hence, where 50% of the resource is used, 50% encroachment is         allowed. Alternatively, an offset or threshold can be applied,         such that the phase-in of encroachment will not occur until         after the threshold or offset value is reached. Any number of         different relationships, whether mathematical (e.g., linear,         logarithmic, step-wise), fuzzy, or otherwise can be used         consistent with this feature. Additionally, the conditional         criteria previously described herein can be applied in         conjunction with the encroachment, such as where proportional         encroachment is only allowed for emergency messages, or for         applications within the reserving application's suite or         linkages.

It will further be recognized that display elements (e.g., windows) need not maintain a static size consistent with the invention. For example, in one variant, the encroachment is allocated through variable sizing of the window or other display element to be displayed (see FIG. 3 a). In the case of a window, proportionate encroachment may comprise resizing the window from a point of no encroachment (such as where the aforementioned encroachment threshold has not yet been reached), to a size which encroaches according to the desired proportion. This can be accomplished using automated window resizing algorithms of the type well known in the personal computer programming arts (such as in the Microsoft Windows® system, wherein a user can effectively grab a window corner to enlarge the window without affecting the layout of the contents, fonts, data structures, etc. contained within the window. Alternatively, the resizing algorithm can be made fully proportional, such as where all displayed elements within the window are resized as well (somewhat akin to electronically resizing a JPEG or other image). Various other approaches may also be used.

Additionally, the exemplary OCAP implementation uses a basic application priority scheme. Thus, if an application owns some screen real estate and another application with a higher priority requests some or all of the same space, the implementation will be forced to take it away from the owning application, unless a monitor application is registered as the resource contention handler and over-rules the higher priority application's request.

Privileged Application Control of Window Management

When a retail or other client device is connected to a network such as an MSO-based cable network, the network may provide services that require management that cannot be offered by the client device. This is due to the simple fact that client devices cannot be programmed with all of the network specifics of every network to which it might be connected. This is especially true for “thin” client devices which have limited storage resources. Thus, it is desirable to allow an application developed for the specific network environment in which the target client device will be used to be downloaded to that device to control such aspects.

Any application that asserts controlling or management aspects in a client device must have appropriate permission from either the device or the network, depending upon the aspect being controlled. For window management control in the aforementioned cable network, a network application running on the client device must be given appropriate permissions from the MSO. Window management aspects that are controllable by such a “privileged” application include, for example: (i) requesting that focus be transferred to a specific application; (ii) re-ordering the visibility stack (except for the application in focus, which stays on top until focus changes according to the illustrated embodiment); and (iii) resolving screen real estate request conflicts.

Regarding Item (ii), the exemplary embodiment of the invention sets the resolution of re-ordering control to be at least the set of application suites, and/or applications within individual application suites. Furthermore, HScene components between applications are not interspersed for reasons as previously described.

Software Implementation

Referring now to FIG. 4 and Appendices hereto, one exemplary implementation of the window manager according to the present invention is described. It will be recognized that while the following discussion (and code) is rendered with respect to the exemplary HAVi-based embodiment operating in a Java environment, the invention may also be readily practiced in other standards, software environments (including, without limitation C, C++, and Ada), and within various middleware environments (e.g., MHP, OCAP, MHEG, ACAP). Furthermore, the following discussion illustrates but a sample of the possible constructs within the Java environment that are useful with the broader principles of the invention.

Appendix I (AppSuite) is an exemplary class representing a suite of applications that are associated by a host device (e.g., CPE or user device) implementation observing signaling from a network. This signaling indicates for example broadcast services, and the applications resident on the host device that are part of each service provided. It will be appreciated that such services may be bound to a broadcast channel, or may be unbound to group a suite of applications. For example, in the cable context, MHP defines bound applications, and OCAP adds the concept of unbound applications. Bound applications are bound to a service, such as NBC network. When the CPE is tuned to NBC, the bound applications owned by NBC are launched and enabled to run. When the CPE is tuned away from NBC, the bound applications are automatically killed, unless they appear in the next channel to which the user has tuned. This might also be the case for a group of related channels, such as HBO1, HBO2, etc., where the same applications run in each of those channels. Conversely, unbound applications are not tied to a service per se. They are signaled by a table in the OOB channel, and such signaling is always present regardless of the channel to which the user is tuned. Any application or application suite that is unbound will be launched separately from the tuned channel, and is not affected by various service selections.

Appendix II (SuiteStackedChangedEvent) is an exemplary class representing a change event to the display visibility stack 230 previously described. The visibility stack 230 contains applications scenes, which may be visible or hidden. Each application has one scene (i.e., HAVi HScene) associated with it. Each HScene comprises a java.awt.Container class and so can contain java.awt.Components. HAVi goes on to define a set of components, a.k.a. widgets. If a scene is visible, all of the components it contains that are not obscured are visible. When the scene is hidden, so are all of its components. An HScene has no frame or border so the only entity associated with scene display are its components.

Appendix III (SuiteStackListener) is an exemplary interface that allows a privileged application or other entity to listen for change events to the screen visibility stack 230.

To display graphical components in a system using HAVi (FIG. 4), an application will first determine whether its HAVi scene is within the visible or hidden portion of the stack (step 402). This is accomplished via the window manager 202 (i.e., an application can discover its visibility by passing its HScene to a window manager method. If within the visible portion, then the application accesses its HAVi scene (Hscene) using the HsceneFactory (Appendix IV), or a redundant system specific call (step 404). As is well known, Hscene is a HAVi public class which extends the Hcontainer and acts as the base window for all HAVi applications. HScenes cannot be instansiated directly, but rather discovered via HSceneFactory.

Once an application discovers their HScene, they may then add displayable (and even navigable or user-interactive) components to the accessed HScene to implement application-specific graphics (steps 406-408). Next, per step 410, the accessed and modified scene is generated on the viewer's display device. Any navigable components added to the Hscene can be traversed, for example, using an input device such as wireless or wired remote control unit of the type ubiquitous in the art.

The exemplary HSceneTemplate (Appendix V) advantageously allows an application to query its Hscene and, if desired, set attributes thereof such as screen dimensions, coloration, resolution, etc. as is well known in the relevant art.

It will be further recognized by those of ordinary skill given the present disclosure that multiple approaches for implementing the disclosed (e.g., HAVi) extensions may be utilized. For example, in the exemplary context of the HAVi framework, implementation of the screen area reservation described above can be accomplished with the HSceneTemplate (Appendix V) using a new user interface (UI) containing methods to reserve screen real estate. Similarly, for all of the other described managerial functions, the HSceneFactory can implement a new UI. These interfaces can be mandated by any specification or standard that adopts the HAVi UI. For example, GEM incorporates parts of MHP that require the HAVi UI, and OCAP complies. ACAP references GEM (and hence HAVi UI via MHP) as well.

FIG. 5 illustrates a first embodiment of the improved electronic device with window management capability according to the present invention. As shown in FIG. 5, the device 500 generally comprises and OpenCable-compliant embedded system having an RF front end 402 (including modulator/demodulator) for interface with the HFC network 101 of FIG. 1, digital processor(s) 504, storage device 506, and a plurality of interfaces 508 (e.g., video/audio interfaces, IEEE-1394 “Firewire”, USB, serial/parallel ports, etc.) for interface with other end-user apparatus such as televisions, personal electronics, computers, WiFi or other network hubs/routers, etc. Other components which may be utilized within the device (deleted from FIG. 5 for simplicity) include RF tuner stages, various processing layers (e.g., DOCSIS MAC or DAVIC OOB channel, MPEG, etc.) as well as media processors and other specialized SoC or ASIC devices. These additional components and functionality are well known to those of ordinary skill in the cable and embedded system fields, and accordingly not described further herein.

The device 500 of FIG. 5 is also provided with an OCAP 1.0-compliant monitor application and Java-based middleware which, inter alia, manages the operation of the device and applications running thereon. It will be recognized by those of ordinary skill that myriad different device and software architectures may be used consistent with the display element manager of the invention, the device of FIG. 5 being merely exemplary. For example, different middlewares (e.g., MHP, MHEG, or ACAP) may be used in place of the OCAP middleware of the illustrated embodiment.

As previously described, the window manager 202 of the present invention is typically disposed on the device 500 such as on the mass storage device 504, along with a plurality of applications 204. During operation, the window manager 202 maintains and updates the visibility stack 230 such that the in-focus application 232 is maintained at the top of the stack, and the remaining applications (whether in a suite such as the AppSuite class of Appendix I, or otherwise) are ordered there below. The implementation 202 can detect the “privileged” status of one or more applications using Java permissions defined by the applicable standard. In addition to changing the in-focus application, this privileged application can also monitor the stack for change events using the SuiteStackListener interface (Appendix III).

It will further be recognized that the window managing system and methods of the present invention can also advantageously be used in conjunction with (and without interfering with) other functions resident in the CPE, such as for example the hardware registry described in co-owned and co-pending U.S. patent application Ser. No. 10/723,959 filed Nov. 24, 2003 and entitled “METHODS AND APPARATUS FOR HARDWARE REGISTRATION IN A NETWORK DEVICE”, and the error logging functionality described in co-owned and co-pending U.S. patent application Ser. No. 10/722,206 filed Nov. 24, 2003 and entitled “METHODS AND APPARATUS FOR EVENT LOGGING IN AN INFORMATION NETWORK”, both incorporated herein by reference in their entirety. For example, events or errors generated through access or manipulation of the hardware registry and its various associated options (such as a hardware failure or contention deadlock) can be stored and accessed by the window manager 202, such as for use in determining application priority within the stack (e.g., prior failure or deadlock may cause that particular application to be decremented within the visibility stack 230, especially if the error was a display error). Similarly, the window manager 202 can register with and issue error reports relating to, e.g., display stack or application operation. The event logger can be used to inform a registered handler, such as the monitor application, of error or informative messages. The head-end can then query the registered handler for those messages.

Furthermore, the window manager 202 can also be adapted to access the aforementioned hardware registry as part of its application prioritization process within the stack. Myriad other possible uses and interactions between the various inventions are also possible, as will be recognized by those of ordinary skill.

It will be recognized that while certain aspects of the invention are described in terms of a specific sequence of steps of a method, these descriptions are only illustrative of the broader methods of the invention, and may be modified as required by the particular application. Certain steps may be rendered unnecessary or optional under certain circumstances. Additionally, certain steps or functionality may be added to the disclosed embodiments, or the order of performance of two or more steps permuted. All such variations are considered to be encompassed within the invention disclosed and claimed herein.

While the above detailed description has shown, described, and pointed out novel features of the invention as applied to various embodiments, it will be understood that various omissions, substitutions, and changes in the form and details of the device or process illustrated may be made by those skilled in the art without departing from the invention. The foregoing description is of the best mode presently contemplated of carrying out the invention. This description is in no way meant to be limiting, but rather should be taken as illustrative of the general principles of the invention. The scope of the invention should be determined with reference to the claims.

APPENDIX I AppSuite © Copyright 2003-2004 Time Warner Cable, Inc. All rights reserved. import org.dvb.application.AppID;  /**  * This class represents a suite of applications that are associated by a Host device implementation observing signaling from a network indicating broadcast services and the applications that are part of each service. Note that a service may be bound to a broadcast channel (e.g., NBC), or it may be unbound to group a suite of applications.  */ public interface AppSuite {   /**   * Gets the application identifiers of the applications that are part of this suite.   *   * @return A array of application identifiers that are part of this suite.   */  public AppID [ ] getAppIDs( );   /**   * Adds an application identifier to this suite.   *   * @param appID Application identifier of the application to add to this suite.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   */  public void addAppID(AppID appID) throws SecurityException; }

APPENDIX II SuiteStackedChangedEvent  © Copyright 2003-2004 Time Warner Cable, Inc. All rights reserved. import java.util.EventObject; import org.dvb.application.AppID;  /**  * This class represents a change event to the Screen visibility stack. visibility stack contains applications scenes, which may be visibile or hidden.  */ public class SuiteStackChangedEvent extends EventObject {   /**   * A suite was moved to the front of the screen visibility stack.   */  static final int POP_SUITE_TO_FRONT_OF_SCREEN = 0;   /**   * A suite was moved to the back of the screen visibility stack.   */  static final int PUSH_SUITE_TO_BACK_OF_SCREEN = 1;   /**   * An application was moved to the front of a suite's application stack.   */  static final int POP_APP_TO_FRONT_OF_SUITE = 2;   /**   * An application was moved to the back of a suite's application stack.   */  static final int PUSH_APP_TO_BACK_OF_SUITE = 3;   /**   * An application was moved forward one position in a suite's application stack.   */  static final int POP_APP_UP_IN_SUITE = 4;   /**   * An applicatin was moved back one position in a suite's application stack.   */  static final int PUSH_APP_BACK_IN_SUITE = 5;  // Application suite associated with this event.  private AppSuite suite = null;  // Application ID associated with this event.  private AppID appID = null;  // Event code of this event, see event code definitions above.  private int eventType;   /**   * Constructor which can be used for any events not associated with an application   * identifier.   *   * @param source Object generating the event.   * @param eventType Event type as defined by this class.   * @param suite Application suite associated with this event.   */  public SuiteStackChangedEvent(Object source, int eventType, AppSuite suite)  {    super(source);    this.eventType = eventType;    this.suite = suite;  }   /**   * Constructor which can be used for any events not associated with an application   * identifier.   *   * @param source Object generating the event.   * @param eventType Event type as defined by this class.   * @param suite Application suite associated with this event.   * @param appID Application identifier associated with this event.   */  public SuiteStackChangedEvent(Object source, int eventType, AppSuite suite, AppID appID)  {    super (source);    this.eventType = eventType;    this.suite = suite;    this.appID = appID;  }   /**   * Gets the suite the event is associated with.   *   * @return The suite associated with the event.   */  public int getEventType( )  {    return this. eventType;  }   /**   * Gets the suite the event is associated with.   *   * @return The suite associated with the event.   */  public AppSuite getSuite( )  {    return this.suite;  }   /**   * Gets the application ID of the application associated with the event if applicable.   *   * @return AppID of the application associated with the event or null if not   * applicable.   */  public AppID getAppID( )  {    return this.appID;  } }

APPENDIX III SuiteStackListener © Copyright 2003-2004 Time Warner Cable, Inc. All rights reserved.  /**  * This interface allows a privileged application to listen for change events to the Screen visibility stack changes.  */ public interface SuiteStackListener {   /**   * Implementation notifies the listener of changes to the Screen visibility stack by calling this notification method.   *   * @param ssce Event indicating the change to the stack.   */  public void suiteStackChanged(SuiteStackChangedEvent ssce); }

APPENDIX IV SystemSceneFactory © Copyright 2003-2004 Time Warner Cable, Inc. All rights reserved. import org.havi.ui.HSceneFactory; import org.havi.ui.HScene; import javax.tv.service.Service; import org.dvb.application.AppID;   /**   * Any specification or standard mandating a HAVi window manager that includes SystemSceneFactory, or equivalent interface with a different name mandates that HSceneFactory implements this interface.   *   * Methods that throw SecurityException do so when the caller does not have appropriate permission as specified by the implementation type (e.g., MHP, OCAP, ACAP).   */ public interface SystemSceneFactory {   /**   * Requests input focus for the parameter scene. If focus is given, the scene will be placed on top of the scene z-ordering stack, and the gotFocus method of the scene parameter will be called. Applications can request focus using Component.requestFocus( ). However, this method is intended as a proxy so that a controller application can request focus for another application.   *   * @param scene HScene to transfer focus to.   *   * @return True if focus given, false otherwise.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   */  public boolean requestSceneFocus(HScene scene) throws SecurityException;   /**   * Gets the current order of visible and hidden scenes within the screen visibility stack.   *   * @return The Screen visibility stack which contains both hidden and visible applications.   */  public AppSuite [ ] getScreenSceneOrder( );   /**   * Sets a listener for screen visibility stack changes.   *   * @param listener The new listener.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   */  public void setSuiteStackListener(SuiteStackListener ssl) throws SecurityException;   /**   *Gets an application suite assigned to a Service by the implementation of the Host device when the Service is signaled by a network. Service is defined by standards such as OCAP, MHP, GEM, and ACAP. Service suites are automatically created for bound or unbound services as per standards service definitions.   *   * @param service - Service to get the group Id for.   *   * @return The group Id of the parameter Service.   */  public AppSuite getAppSuiteForService(Service service);   /**   * Creates an AppSuite.   *   * @param appIDs Array of AppID's to be used to create the suite.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if the appIDs parameter is null, empty, or contains   *    an invalid AppID.   */  public void createAppSuite(AppID [ ] appIDs) throws SecurityException, IllegalArgumentException;   /**   * Pops a scene to the front a an application suite. If this causes the scene to go to the very front of all applications, requestSceneFocus will be called for the scene. If requestSceneFocus fails, the pop will fail.   *   * @param scene The scene to pop to the front of the group.   * @param suiteId The Id of the group the application that owns the scene belongs to.   *   * @return True in all cases unless the pop causes the scene to go to the top of all other scenes. In that case requestSceneFocus is called and the result of that call is returned.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if scene or suiteId are not already assigned.   */  public boolean popSceneToSuiteFront(HScene scene, int suiteId) throws SecurityException, IllegalArgumentException;   /**   * Pushes a scene to the rear of an application suite.   *   * @param scene The scene to push to the rear of the suite.   * @param suiteId The Id of the suite the application that owns the scene belongs to.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if scene or suiteId are not already assigned.   */  public void pushSceneToSuiteRear(HScene scene, int suiteId) throws SecurityException, IllegalArgumentException;   /**   *Pushes a scene back one position in the visibility stack of a suite.   *   * @param scene The scene to push to the rear of the suite.   * @param suiteId The Id of the suite the application that owns the scene belongs to.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if scene or suiteId are not already assigned.   */  public void pushSceneBackInSuite(HScene scene, int suiteId) throws SecurityException, IllegalArgumentException;   /**   * Pops a scene forward one position in the visibility stack of a suite.   *   * @param scene The scene to push to the rear of the suite.   * @param suiteId The Id of the suite the application that owns the scene belongs to.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if scene or suiteId are not already assigned.   */  public void popSceneForwardInSuite(HScene scene, int suiteId) throws SecurityException, IllegalArgumentException;   /**   * Pops a suite to the front of all other suites visible or hidden in the screen visibility stack. If the suite is not already at the front this will cause requestSceneFocus will be called for the scene at the front of the suite. If requestSceneFocus fails, the pop will fail.   *   * @param suiteId The Id of the group the application that owns the scene belongs to.   *   * @return True in all cases unless the pop causes the scene to go to the top of all other scenes. In that case requestSceneFocus is called and the result of that call is returned.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if suiteId is not already assigned.   */  public boolean popSuiteToScreenFront(int suiteId) throws SecurityException, IllegalArgumentException;   /**   * Pushes a suite to the rear of all applications visible or hidden in the screen visibility stack.   *   * @param suiteId The Id of the suite the application that owns the scene belongs to.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   * @throws IllegalArgumentException if suiteId is not already assigned.   */  public void pushSuiteToScreenRear(HScene scene, int suiteId) throws SecurityException, IllegalArgumentException;   /**   * Sets the visibility of a scene. Either hides or un-hides. Affects all components associated with the scene.   *   * @param scene The scene to hide or un-hide.   * @param visible True to un-hide if hidden, or False to hide if visible.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   */  public void setVisibility(HScene scene, boolean visible) throws SecurityException;   /**   * Iconfies an HScene. The Icon to display is associated with the application during network specific (e.g., OCAP, MHP, ACAP) signaling of the application. All of the visible components of the scene are substituted with the icon. It is implementation specific as to where the icon is displayed.   *   * @param scene The scene to iconify.   *   * @throws SecurityException specific to the implementation type (e.g., MHP, OCAP, ACAP).   */  public void iconify(HScene scene) throws SecurityException; }

APPENDIX V SystemSceneTemplate © Copyright 2003-2004 Time Warner Cable, Inc. All rights reserved. import org.havi.ui.HScene; import org.havi.ui.HSceneTemplate; import org.davic.resources.ResourceClient;  /**  * The SystemSceneTemplate is used to demonstrate how the patent concepts can be implemented with HAVi. A standard incorporating HAVi would mandate that org.havi.ui.HSceneTemplate implement this interface.  */ public interface SystemSceneTemplate {   /**   * Use java.awt.Point & Dimension for screen area reservation.   */  public final int AREA_PIXEL_LOCATION = 0;   /**   * Use org.havi.ui.HScreenPoint & HScreenDimension for screen area reservation.   */  public final int AREA_SCREEN_LOCATION = 1;   /**   * Cannot be overlapped by any application;   */  public final int PRIORITY_GLOBAL = 0x00000001;   /**   * Can be overlapped by applications in the same service or group.   */  public final int PRIORITY_GROUP = 0x00000002;   /**   * Can be overlapped by applications with higher application priority.   */  public final int PRIORITY_APPLICATION = 0x00000004;   /**   * Reserves an area of the screen for an application's HScene. This reservation prevents other components from overlaying it, including components in other applications unless permitted by the application as described by the priority parameter definition of this method.   * @param scene Scene belonging to the application wishing to reserve the screen portion.   * @param preference If AREA_PIXEL_LOCATION, then use java.awt.Point & Dimension, else if   *  AREA_SCREEN_LOCATION use org.havi.ui.HSreenPoint & HScreenDimension for location and   *  dimension parameters.   * @param location Location of the area to be reserved.   * @param dimension Dimension of the area to be reserved.   * @param priority If PRIORITY_GLOBAL the area cannot be overlapped by any component in any application. This priority is very constraining and should be used with caution.   *  If PRIORITY _GROUP the area can be overlapped by components belonging to applications within the same service or group. The notion of applications within a service is defined by standards such as OCAP, ACAP, and MHP. The notion of applications within a group is defined by this disclosure. If PRIORITY_APPLICATION the area can be overlapped by components belonging to applications with higher priority than the calling application. The notion of application priority is also defined by the aforementioned standards. These priorities can be bitwise ORed together. In that case the rules of each included priority are followed by the implementation.   * @param resourceClient DAVIC framework resource client used for shared resource management. Defined by the aforementioned standards.   *   * @throws IllegalArgumentException if location and dimension do not describe an area within the scene.   * @throws IllegalArgumentException if scene or preference are null, or do not point to valid objects owned by the calling application.   * @throws IllegalArgumentException if preference isn't one of AREA_PIXEL_ LOCATION, or   *  AREA_SCREEN_LOCATION.   * @throws IllegalArgumentException if priority isn't any inclusive of PRIORITY_GLOBAL,   *  PRIORITY_GROUP, or PRIORITY_APPLICATION.   */  public void reserveScreenArea(HScene scene, int preference, Object location, Object dimension, int priority, ResourceClient resourceClient) throws IllegalArgumentException; } 

What is claimed is:
 1. A non-transitory computer readable apparatus for use in a content distribution network comprising at least a first entity configured to distribute content and a plurality of second entities configured to receive said content, said apparatus comprising a display element manager adapted for use on at least one of said plurality of second entities said display element manager comprising a non-transitory medium adapted to store a computer program comprising a management component associated therewith, said computer program comprising a plurality of instructions which are configured to, when executed, cause said at least one of said plurality of second entities to: enable said management component thereof to manage a plurality of application scene objects associated with respective ones of software applications via a visibility stack, said plurality of application scene objects comprise at least one Home Audio Video interoperability (HAVi) Hscene object; wherein said management component of said second entity is further adapted to transmit information regarding said plurality of application scene objects upstream to said first entity, said first entity adapted to direct operation of said management component based at least in part on said information; wherein a portion of said plurality of software applications are linked to one another such that when a first application scene object associated with a first software application is manipulated to a different location within said visibility stack, at least one second application scene object associated with at least one second software application linked to said first application is identified and placed into said visibility stack following said manipulation of said first application scene object; wherein a number of said at least one second application scene objects are hidden, said number being dynamically varied based at least in part on at least one parameter; and wherein said display element manager of said at least one of said plurality of second entities receives permission to direct said operation of said management component from said first entity.
 2. The display element manager of claim 1, wherein said manager is rendered substantially in an object-oriented language.
 3. The display element manager of claim 2, wherein at least a portion of said Hscene objects comprise an object-based container class adapted to contain a plurality of components.
 4. The display element manager of claim 1, wherein each of said application scene objects have only container class components associated with their scene display.
 5. The display element manager of claim 1, wherein said visibility stack is adapted to receive one or more change event classes.
 6. The display element manager of claim 1, wherein said visibility stack comprises at least one visible portion and at least one hidden portion.
 7. The display element manager of claim 6, wherein one of said software applications is configured to display graphical elements via: a determination of whether a relevant one of said application scene objects resides within said at least one visible portion or said at least one hidden portion of said stack; when said relevant one of said application scene objects resides within said at least one visible portion, access said relevant one via a system call; and display said graphical elements of said relevant one of said application scene objects.
 8. The display element manager of claim 7, wherein said determination comprises passing said relevant one of said application scene objects to a window manager process.
 9. The display element manager of claim 7, wherein said display further comprises an additional display of displayable components to said relevant one of said application scene objects, and generation of application-specific graphics based at least in part thereon.
 10. A non-transitory computer readable apparatus comprising a display element manager adapted for use on a client device associated with a network, said display element manager comprising a computer program comprising a management component associated therewith, and comprising a plurality of instructions which are configured to, when executed, cause said apparatus to: enable said management component to manage a plurality of application scene objects associated with respective ones of software applications via a visibility stack, said plurality of application scene objects comprise at least one Home Audio Video interoperability (HAVi) Hscene object; wherein: said component is further adapted to transmit information regarding said plurality of application scene objects upstream to a remote network entity, said remote network entity adapted to direct operation of said component based at least in part on said information; a portion of said plurality of applications are linked to one another such that when a first application scene object associated with a first application is manipulated to a different location within said visibility stack, at least one second application scene object associated with at least one second application linked to said first application is identified and placed into said visibility stack following said manipulation of said first application scene object; a number of said at least one second application scene objects are hidden, said number being dynamically varied based at least in part on at least one parameter; and said display element manager receives permission to direct said operation of said component from said network.
 11. The method of claim 10, wherein said visibility stack comprises a hierarchical list of applications configured to run on said network device.
 12. The method of claim 10, wherein said management component is further configured to selectively hide a percentage of applications in said visibility stack, said percentage based on a priority scheme such that application windows are hidden starting from a bottom of said visibility stack and working upwards in stack position.
 13. A method of enabling remote management of one or more components of a client device, said method comprising: providing a display manager at a network entity of a distribution network with which said client device is in communication, said display manager comprising a privileged application that receives permission from said content distribution network to selectively control operation of a management component of said client device, said management component configured to manage a plurality of display elements associated with respective ones of software applications via a visibility stack associated therewith, said plurality of display elements comprising at least one Home Audio Video interoperability (HAVi) Hscene object; causing said management component to transmit information relating to said plurality of HAVi Hscene objects upstream to said network entity; and accessing said management component from said network entity and, via providing access to addresses associated with individual portions of said visibility stack, permitting said network entity to manipulate said visibility stack by accessing said addresses; wherein, a number of said plurality of display elements are selectively hidden, said number varying dynamically based at least in part on at least one parameter.
 14. The method of claim 13, wherein said network entity comprises a software process in data communication with said management component via one or more communication channels, and said act of accessing comprises transmitting at least one signal from said software process to said management component to cause said management component to be accessed by said software process.
 15. The method of claim 13, wherein a portion of said software applications are linked to one another such that when a first application scene object associated with a first software application is manipulated to a different location within said visibility stack, at least one second application scene object associated with at least one second software application linked to said first application is identified and placed into said visibility stack following said manipulation of said first application scene object.
 16. The method of claim 13, wherein at least one of said software applications is configured to display graphical elements by: determining whether a relevant one of said application scene objects resides within said at least one visible portion or said at least one hidden portion of said stack; when said relevant one of said application scene objects resides within said at least one visible portion, accessing said relevant one using via a system call; and displaying said graphical elements of said relevant one of said application scene objects.
 17. The method of claim 16, wherein said act of determining comprises passing said relevant one of said application scene objects to a window manager process.
 18. The method of claim 16, wherein said act of displaying further comprises adding displayable components to said relevant one of said application scene objects, and generating application-specific graphics based at least in part thereon. 